Compound X on reaction with O3 followed by \(\frac{Zn}{H_2O}\) gives formaldehyde and 2-methyl propanal as products. The compound X is:
- 3 -Methylbut -1-ene
- 2-Methylbut -1-ene
- 2-Methylbut - 2-ene
- Pent - 2- ene
The Correct Option is A
Approach Solution - 1
To determine compound X, we analyze the details of its reaction with ozone(O3) followed by zinc and water reduction(Zn/H2O). This is an ozonolysis reaction, which breaks down alkenes into carbonyl compounds.
1. Products given are formaldehyde(HCHO) and 2-methyl propanal(CH3CH(CH3)CHO). Formaldehyde indicates one terminal carbon in a double bond, as it is derived from an alkene ending with a -CH=O group.
2. For 2-methyl propanal to form, the remaining carbon chain must include a propyl group attached to a carbon with a methyl group, which was part of a double bond before ozonolysis.
Let's examine the given options:
| Compound | Structure | Ozonolysis Products |
|---|---|---|
| 3-Methylbut-1-ene | CH2=C(CH3)CH2CH3 | HCHO, CH3CH(CH3)CHO |
| 2-Methylbut-1-ene | CH3CH=C(CH3)CH3 | CH3CHO, CH3CH2CHO |
| 2-Methylbut-2-ene | CH3CH=C(CH3)CH3 | CH3CHO, CH3CHO |
| Pent-2-ene | CH3CH=CHCH2CH3 | CH3CHO, CH3CHO |
3. From the table, 3-Methylbut-1-ene yields the required products of formaldehyde and 2-methyl propanal after ozonolysis. Thus, the correct compound X is 3-Methylbut-1-ene.
Approach Solution -2
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Concepts Used:
Alkenes
Alkenes
In organic chemistry, an alkene is a hydrocarbon containing a carbon-carbon double bond.[1]
Alkene is often used as synonym of olefin, that is, any hydrocarbon containing one or more double bonds.
Read More: Ozonolysis
IUPAC Nomenclature of Alkenes
- An alkene or cycloalkene is indicated by the suffix (ending) ene.
- For the root name, the longest chain must include both carbon atoms of the double bond.
- The root chain must be numbered beginning at the end closest to a double bond carbon atom. If the double bond is in the chain's centre, the nearest substituent rule is used to determine where the numbering begins.
- If the compound contains more than one double bond, it is named with a diene, triene, or equivalent prefix indicating the number of double bonds, and each double bond is assigned a locator number.
Read More: Unsaturated Hydrocarbon